Logback error

Logback file error : no applicable action for [rollingPolicy], current pattern is [[configuration][appender][rollingPolicy]]

<configuration>
    <!-- this is the important line -->
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <File>/media/sara/682AA7A32AA76D2E/study/ifkaarproject/articateInScala/log/akka.log</File>
        <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
            <fileNamePattern>/media/sara/682AA7A32AA76D2E/study/ifkaarproject/articateInScala/log/akka.%i.log</fileNamePattern>
            <minIndex>1</minIndex>
            <maxIndex>3</maxIndex>
        </rollingPolicy>
        <triggeringPolicy class="com.bigbasket.dapp.utilities.SizeBasedTriggeringPolicy">
            <maxFileSize>5MB</maxFileSize>
        </triggeringPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5level] %logger{0} %X{akkaSource} %msg%n</pattern>
        </encoder>
    </appender>
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger{0} %X{akkaSource} -%msg%n</pattern>
        </encoder>
    </appender>
    <root level="info">
        <appender-ref ref="FILE" />
        <appender-ref ref="STDOUT" />
    </root>
</configuration>